可以手动计算出F统计量的
F test for exclusion restriction
• Exclusion restriction: βj =0
• t test: test whether one variable has effect or not
• F test: test whether one group of variables have effect or not
H0: β1 =0, β2 =0
1. Run an unrestricted regression, and get SSRu , Ru2
log(wage)=β0 +β1 college +β2 univ +β3 exper+u
2. Run an restricted regression, and get SSRr , Rr2
log(wage)=β0 +β3 exper+u
3. Calculate F statistics
F=[(SSRr-SSRu)/q]/[SSRu/n-K-1)]
4.get p value


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